fix(perf): eliminate redundant terminal wake work (#2962)

* fix(perf): eliminate redundant terminal wake work

* fix(perf): harden release benchmark gate

* test(perf): strengthen performance guardrails

1 files changed, 26 insertions, 0 deletions

diff --git a/scripts/release_perf_producer.pl b/scripts/release_perf_producer.pl
new file mode 100755
index 00000000..e99973cc
--- /dev/null
+++ b/scripts/release_perf_producer.pl
@@ -0,0 +1,26 @@
+#!/usr/bin/env perl
+use strict;
+use warnings;
+use Time::HiRes qw(clock_gettime sleep CLOCK_MONOTONIC);
+
+my ($rate, $gate, $label) = @ARGV;
+die "usage: $0 <rate-hz> <gate-file> <label>\n"
+    unless defined $rate && defined $gate && defined $label
+    && length $gate && length $label;
+die "rate must be a positive number\n"
+    unless $rate =~ /\A(?:[0-9]+(?:\.[0-9]*)?|\.[0-9]+)\z/ && $rate > 0;
+
+sleep 0.01 until -e $gate;
+$| = 1;
+my $period = 1 / $rate;
+my $next = clock_gettime(CLOCK_MONOTONIC);
+my $sequence = 0;
+while (1) {
+    $sequence++;
+    printf "\rbench-output-%08d-%s", $sequence, $label;
+    $next += $period;
+    my $now = clock_gettime(CLOCK_MONOTONIC);
+    $next = $now + $period if $next < $now - $period;
+    my $remaining = $next - $now;
+    sleep $remaining if $remaining > 0;
+}